CN117470469A - A gas-based pressure measurement and control system and measurement and control method - Google Patents

Abstract

The invention relates to the technical field of pressure sensor testing, in particular to a pressure measurement and control system and a measurement and control method based on gas, wherein the system comprises an electric control regulating valve, a first electromagnetic valve, a second electromagnetic valve and a product clamping seat to be tested, which are sequentially connected through a gas pipe; a third electromagnetic valve is arranged between the second electromagnetic valve and the clamping seat of the product to be tested; a first pressure sensor is arranged between the electric control regulating valve and the first electromagnetic valve; a high-pressure gas cylinder is connected to the gas pipe corresponding to the space between the first electromagnetic valve and the second electromagnetic valve; a second pressure sensor is connected to the corresponding air pipe between the third electromagnetic valve and the clamping seat of the product to be tested; the electric control regulating valve, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the first pressure sensor and the second pressure sensor are respectively connected with a PLC, and the PLC is controlled by an upper computer. The scheme can realize the stable and accurate control of the gas pressure, is convenient for the calibration and test procedures of the pressure sensor, and can be used for measuring leakage, pressure resistance and explosion pressure by using the gas.

Description

A gas-based pressure measurement and control system and measurement and control method

Technical field

The invention relates to the technical field of motor detection, and in particular to a gas-based pressure measurement and control system and measurement and control method.

Background technique

Pressure sensors usually consist of pressure-sensitive components and signal processing units. They are devices or devices that can sense pressure signals and convert the pressure signals into usable output electrical signals according to certain rules. They are widely used in various industrial automatic control environments. , involving water conservancy and hydropower, railway transportation, intelligent buildings, production automation, aerospace, military industry, petrochemicals, oil wells, electric power, ships, machine tools, pipelines and many other industries.

In order to ensure that the pressure sensors put on the market are all qualified products, manufacturers need to perform pressure tests on the pressure sensors before leaving the factory in order to analyze the performance of the corresponding pressure sensors and screen out qualified products.

At present, most domestic pressure sensor calibration and testing require the purchase of imported pressure controllers. The procurement cycle is long, expensive, and maintenance costs are high. They cannot be used in low and high temperature environments. The controlled gas temperature is also strictly controlled. The temperature cannot be Above 100℃, otherwise the service life of the equipment will be greatly reduced.

Therefore, there is an urgent need for a new technical solution to solve the above existing technical problems.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned problems of the prior art and provide a gas-based pressure measurement and control system to solve the technical problems of high cost and harsh use environment of the detection equipment in the traditional method of using imported detection equipment.

The above objectives are achieved through the following technical solutions:

A gas-based pressure measurement and control system, including an electronically controlled regulating valve, a first solenoid valve, a second solenoid valve and a product-to-be-tested clamping seat sequentially connected through a trachea;

A third solenoid valve is provided on the corresponding air pipe between the second solenoid valve and the product-to-be-tested holding seat. The air inlet of the third solenoid valve is connected to the air pipe. The third solenoid valve The air outlet is connected to the outside;

A first pressure sensor is connected to the corresponding air pipe between the electronically controlled regulating valve and the first solenoid valve;

A high-pressure gas bottle is connected to the corresponding air pipe between the first solenoid valve and the second solenoid valve;

A second pressure sensor is connected to the corresponding air pipe between the third solenoid valve and the product-to-be-tested holding seat;

The air inlet end of the electronically controlled regulating valve is connected to an external pressure supply device through a trachea;

The electronically controlled regulating valve, the first solenoid valve, the second solenoid valve, the third solenoid valve, the first pressure sensor and the second pressure sensor are respectively connected to a PLC, and the PLC is Host computer control.

Further, a safety valve is connected to the corresponding air pipe between the electronically controlled regulating valve and the first solenoid valve.

Further, the high-pressure gas cylinder is also connected to a drain hand valve.

Further, the capacity of the high-pressure gas bottle is 2L.

Further, the air pressure input by the pressure supply device is 300 bar.

A measurement and control method for a gas-based pressure measurement and control system, including the following steps:

Step (1) Build and control pressure. The host computer sends instructions to control the PLC to drive the electronically controlled regulating valve, the first solenoid valve and the second solenoid valve to conduct, and control the third solenoid valve to close. , forming an energy storage pool, and inputting air pressure into the energy storage pool through the pressure supply device to store energy in the high-pressure gas cylinder;

When the first pressure sensor detects that the air pressure in the energy storage pool reaches a predetermined pressure value, the feedback signal of the first pressure sensor is sent to the host computer via the PLC, and the host computer sends instructions to control the PLC drive. The first solenoid valve is closed;

Step (2) product testing: the host computer sends instructions to control the PLC to drive the second solenoid valve to conduct, which is formed between the high-pressure gas cylinder, the second solenoid valve and the clamping seat of the product to be tested Test circuit, the high-pressure gas bottle releases stored energy and transmits it to the product-to-be-tested clamping seat, providing air pressure to the product-to-be-tested connected to the product-to-be-tested clamping seat, and monitors it in real time through the second pressure sensor Test the air pressure value in the loop, and feed back the signal to the host computer through the PLC to implement testing of the product to be tested;

Step (3) Exhaust reset. After the product under test completes the test, the host computer sends an instruction to control the PLC to drive the second solenoid valve to close, and control the third solenoid valve to conduct, and the test circuit The medium pressure is discharged outward; if you continue to test, cycle the above steps.

Further, the step (2) also includes step (2-1) air leakage detection. If the second pressure sensor detects in real time that the air pressure value in the test circuit drops higher than the preset safety value, and the feedback signal is passed through the PLC to the host computer; the host computer determines that the product to be tested is leaking and the test result is unqualified, and sends an instruction to control the PLC to drive the second solenoid valve to close, thereby realizing the inspection of the high-pressure gas cylinder. Lock down and issue a gas leak alarm.

Further, the preset safety value is 3bar.

beneficial effects

The gas-based pressure measurement and control system provided by the present invention, by equipping a high-pressure gas bottle as an energy storage, can balance the pressure drop caused by a short-term temperature drop, making the output pressure more stable; since no real-time operation is performed during the test phase For pressure control, several high-precision components are omitted from the internal hardware part, making the entire system lower cost and longer lifespan. It can also effectively get rid of dependence on expensive imported equipment and save manufacturers expenses.

Description of the drawings

Figure 1 is a schematic diagram of the pressure building and pressure control stage of a gas-based pressure measurement and control system according to the present invention;

Figure 2 is a schematic diagram of the product testing stage of a gas-based pressure measurement and control system according to the present invention;

Figure 3 is a schematic diagram of the gas leakage detection stage of a gas-based pressure measurement and control system according to the present invention;

Figure 4 is a schematic diagram of the exhaust reset stage of a gas-based pressure measurement and control system according to the present invention.

Icon mark:

1-Electronically controlled regulating valve, 2-First solenoid valve, 3-Second solenoid valve, 4-Third solenoid valve, 5-First pressure sensor, 6-Second pressure sensor, 7-PLC, 8-To be measured Product clamping seat, 9-high-pressure gas cylinder, 10-safety valve, 11-drainage hand valve.

Detailed ways

The present invention will be described in further detail below based on the drawings and examples. The described embodiments are only some of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

As shown in Figure 1, a gas-based pressure measurement and control system includes an electronically controlled regulating valve 1, a first solenoid valve 2, a second solenoid valve 3 and a product-to-be-tested clamping seat 8 connected sequentially through a trachea;

A third solenoid valve 4 is provided on the corresponding air pipe between the second solenoid valve 3 and the product-to-be-tested holding seat 8, and the air inlet of the third solenoid valve 4 is connected to the air pipe. The air outlet of the third solenoid valve 4 is connected to the outside;

A first pressure sensor 5 is connected to the corresponding air pipe between the electronically controlled regulating valve 1 and the first solenoid valve 2;

A high-pressure gas bottle 9 is connected to the corresponding air pipe between the first solenoid valve 2 and the second solenoid valve 3;

A second pressure sensor 6 is connected to the corresponding air pipe between the third solenoid valve 4 and the product-to-be-tested holding seat 8;

The air inlet end of the electronically controlled regulating valve 1 is connected to an external pressure supply device through a trachea;

The electronically controlled regulating valve 1, the first solenoid valve 2, the second solenoid valve 3, the third solenoid valve 4, the first pressure sensor 5 and the second pressure sensor 6 are connected to the PLC 7 respectively. connection, the PLC7 is controlled by the host computer.

Specifically, the electronic control valve 1 in this system uses a standard programmable electronically controlled proportional valve, and the first solenoid valve 2, the second solenoid valve 3 and the third solenoid valve 4 use high-precision industrial pressure sensors to achieve the stability of gas pressure. And precise control, it can be used in the calibration and testing process of pressure sensors, and can also be used in scenarios such as gas leak detection and pressure resistance and burst pressure measurement.

The specifications of the first pressure sensor 5 in this embodiment are: 300Bar 4-20mA 0.1%FS;

The specifications of the first pressure sensor 6 are: 300bar SENT 0.02~0.05%.

As an optimization of this system, a safety valve 10 is also connected to the corresponding air pipe between the electronically controlled regulating valve 1 and the first solenoid valve 2. Because when the air pressure in the energy storage tank is too high, the safety valve 10 will 10Release pressure to ensure the safety of the system.

The capacity of the high-pressure gas cylinder 9 in this system is 2L. Since it is equipped with a 2L high-pressure gas cylinder as energy storage, it can balance the pressure drop caused by the short-term temperature drop, making the output pressure more stable and conducive to eliminating high-precision The pressure difference between the pressure sensor 2 and the product to be measured improves the output accuracy of the pressure control equipment.

In order to facilitate the later maintenance of the high-pressure gas cylinder 9, in this embodiment, a drain hand valve 11 is also connected to the high-pressure gas cylinder 9 to facilitate internal cleaning.

The air pressure input by the pressure supply device in this embodiment is 300 bar.

In addition, this embodiment also provides a measurement and control method for a gas-based pressure measurement and control system, which includes the following steps:

As shown in Figure 1, in step (a) to establish and control the pressure, the host computer sends instructions to control the PLC 7 to drive the electronically controlled regulating valve 1, the first solenoid valve 2 and the second solenoid valve 3 to conduct. , control the third solenoid valve 4 to close to form an energy storage pool, and input air pressure to the energy storage pool through the pressure supply device to store energy in the high-pressure gas cylinder 9;

When the first pressure sensor 2 detects that the air pressure in the energy storage tank reaches a predetermined pressure value, the feedback signal of the first pressure sensor 5 is sent to the host computer via the PLC 7, and the host computer sends an instruction to control the PLC7 drives the first solenoid valve 2 to close;

As shown in Figure 2, in step (b) product testing, the host computer sends instructions to control the PLC 7 to drive the second solenoid valve 3 to conduct. The high-pressure gas cylinder 9, the second solenoid valve 3 and the A test loop is formed between the clamping bases 8 of the product to be tested. The high-pressure gas bottle 9 releases stored energy and transmits it to the clamping base 8 of the product to be tested. The product provides air pressure, and the air pressure value in the test circuit is monitored in real time through the second pressure sensor 6, and the feedback signal is sent to the host computer through the PLC 7 to realize the test of the product to be tested;

As shown in Figure 4, in step (c) exhaust reset, after the product under test completes the test, the host computer sends an instruction to control the PLC 7 to drive the second solenoid valve 3 to close, and controls the third solenoid valve to close. Valve 4 is turned on to discharge the air pressure in the test circuit to the outside; if the test continues, the above steps are repeated.

The above steps are the steps under the condition that the product to be tested is qualified. If there is a problem with the product to be tested, (b-1) is also included, specifically:

As shown in Figure 3, the step (b) also includes step (b-1) air leakage detection. If the second pressure sensor 6 detects in real time that the air pressure value in the test circuit drops higher than the preset safety value, and feeds back The signal is sent to the host computer via the PLC7;

The host computer determines that the product to be tested is leaking and the test result is unqualified, and sends an instruction to control the PLC 7 to drive the second solenoid valve 3 to close, thereby blocking the high-pressure gas cylinder 9 and emitting gas. Leak alert.

The default safety value in this embodiment is 3bar.

The above description is only for illustrating the embodiments of the present invention and is not intended to limit the present invention. For those skilled in the art, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention can be made. All should be included in the protection scope of the present invention.

Claims (8)

1. The pressure measurement and control system based on the gas is characterized by comprising an electric control regulating valve (1), a first electromagnetic valve (2), a second electromagnetic valve (3) and a product clamping seat (8) to be tested, which are sequentially connected through a gas pipe;

a third electromagnetic valve (4) is arranged on an air pipe corresponding to the space between the second electromagnetic valve (3) and the product clamping seat (8) to be tested, an air inlet of the third electromagnetic valve (4) is connected with the air pipe, and an air outlet of the third electromagnetic valve (4) is communicated with the outside;

a first pressure sensor (5) is connected to the air pipe corresponding to the position between the electric control regulating valve (1) and the first electromagnetic valve (2);

a high-pressure gas cylinder (9) is connected to the gas pipe corresponding to the space between the first electromagnetic valve (2) and the second electromagnetic valve (3);

a second pressure sensor (6) is connected to the air pipe corresponding to the space between the third electromagnetic valve (4) and the clamping seat (8) of the product to be tested;

the air inlet end of the electric control regulating valve (1) is connected with an external pressure supply device through an air pipe;

the electric control regulating valve (1), the first electromagnetic valve (2), the second electromagnetic valve (3), the third electromagnetic valve (4), the first pressure sensor (5) and the second pressure sensor (6) are respectively connected with the PLC (7), and the PLC (7) is controlled by an upper computer.

2. A gas-based pressure measurement and control system according to claim 1, characterized in that a safety valve (10) is also connected to the gas pipe between the electrically controlled regulator valve (1) and the first solenoid valve (2).

3. The pressure measurement and control system based on gas according to claim 1, characterized in that the high-pressure gas cylinder (9) is further connected with a blowdown hand valve (11).

4. A gas-based pressure measurement and control system according to claim 1, characterized in that the capacity of the high-pressure gas cylinder (9) is 2L.

5. A gas-based pressure measurement and control system according to claim 1, wherein the gas pressure input by the pressure supply device is 300bar.

6. The measurement and control method of any one of the gas-based pressure measurement and control systems according to claims 1 to 5, comprising the steps of:

step (a) building up pressure, the upper computer sends an instruction to control the PLC (7) to drive the electric control regulating valve (1), the first electromagnetic valve (2) and the second electromagnetic valve (3) to be conducted, the third electromagnetic valve (4) is controlled to be closed, an energy storage pool is formed, air pressure is input into the energy storage pool through the pressure supply device, and energy is stored in the high-pressure air bottle (9);

when the first pressure sensor (2) monitors that the air pressure in the energy storage tank reaches a preset pressure value, a feedback signal of the first pressure sensor (5) is transmitted to the upper computer through the PLC (7), and the upper computer sends an instruction to control the PLC (7) to drive the first electromagnetic valve (2) to be closed;

the method comprises the steps that (b) a product test is carried out, an upper computer sends an instruction to control a PLC (7) to drive a second electromagnetic valve (3) to be conducted, a test loop is formed among a high-pressure gas cylinder (9), the second electromagnetic valve (3) and a product clamping seat (8) to be tested, the high-pressure gas cylinder (9) releases energy storage and transmits the energy storage to the product clamping seat (8) to be tested, air pressure is provided for a product to be tested connected with the product clamping seat (8) to be tested, the air pressure value in the test loop is monitored in real time through a second pressure sensor (6), and a feedback signal is transmitted to the upper computer through the PLC (7) to realize the test of the product to be tested;

step (c) exhausting and resetting, after the product to be tested is tested, the upper computer sends an instruction to control the PLC (7) to drive the second electromagnetic valve (3) to be closed, and control the third electromagnetic valve (4) to be conducted, so that the air pressure in the test loop is discharged outwards; if the test is continued, the above steps are looped.

7. The method according to claim 6, wherein the step (b) further comprises the step (b-1) of detecting the air leakage if the second pressure sensor (6) monitors that the air pressure value in the test loop drops above a preset safety value in real time, and feeding back a signal to the upper computer through the PLC (7);

the upper computer judges that the product to be detected is leaked, the detection result is unqualified, and sends an instruction to control the PLC (7) to drive the second electromagnetic valve (3) to be closed, so that the high-pressure gas cylinder (9) is blocked, and a gas leakage alarm is sent.

8. The method of claim 7, wherein the predetermined safety value is 3bar.